<template>
	<view class="lime-clipper" :class="{open: value}" disable-scroll :style="'z-index: ' + zIndex + ';' + customStyle">
		<view class="lime-clipper-mask" @touchstart.stop.prevent="clipTouchStart" @touchmove.stop.prevent="clipTouchMove"
			@touchend.stop.prevent="clipTouchEnd">
			<view class="lime-clipper__content" :style="clipStyle">
				<view class="lime-clipper__edge" v-for="(item, index) in [0, 0, 0, 0]" :key="index"></view>
			</view>
		</view>
		<image class="lime-clipper-image" @error="imageLoad" @load="imageLoad" @touchstart="imageTouchStart"
			@touchmove="imageTouchMove" @touchend="imageTouchEnd" :src="image"
			:mode="imageWidth == 'auto' ? 'widthFix' : 'scaleToFill'" v-if="image" :style="imageStyle" />
		<canvas :canvas-id="canvasId" id="lime-clipper" disable-scroll
			:style="'width: ' + canvasWidth * scaleRatio + 'px; height:' + canvasHeight * scaleRatio + 'px;'"
			class="lime-clipper-canvas"></canvas>
		<view class="lime-clipper-tools">
			<view class="lime-clipper-tools__btns">
				<view v-if="isShowCancelBtn" @tap="cancel">
					<slot name="cancel" v-if="$slots.cancel" />
					<view v-else class="cancel">取消</view>
				</view>
				<view v-if="isShowPhotoBtn" @tap="uploadImage">
					<slot name="photo" v-if="$slots.photo" />
					<image v-else :src="photoImg" />
				</view>
				<view v-if="isShowRotateBtn" @tap="rotate">
					<slot name="rotate" v-if="$slots.rotate" />
					<image v-else :src="rotateImg" data-type="inverse" />
				</view>
				<view v-if="isShowConfirmBtn" @tap="confirm">
					<slot name="confirm" v-if="$slots.confirm" />
					<view v-else class="confirm">确定</view>
				</view>
			</view>
			<slot></slot>
		</view>
	</view>
</template>

<script>
	import rotateImg from './images/rotate.svg'
	import photoImg from './images/photo.svg'
	import { pathToBase64, determineDirection, calcImageOffset, calcImageScale, calcImageSize, calcPythagoreanTheorem,
		clipTouchMoveOfCalculate, imageTouchMoveOfCalcOffset } from './utils';
	const cache = {}
	export default {
		name: 'lime-clipper',
		props: {
			value: {
				type: Boolean,
				default: true
			},
			// #ifdef MP-WEIXIN
			type: {
				type: String,
				default: '2d'
			},
			// #endif
			customStyle: {
				type: String,
			},
			canvasId: {
				type: String,
				default: 'lime-clipper'
			},
			zIndex: {
				type: Number,
				default: 99
			},
			imageUrl: {
				type: String
			},
			fileType: {
				type: String,
				default: 'png'
			},
			quality: {
				type: Number,
				default: 1
			},
			width: {
				type: Number,
				default: 400
			},
			height: {
				type: Number,
				default: 400
			},
			minWidth: {
				type: Number,
				default: 200
			},
			maxWidth: {
				type: Number,
				default: 600
			},
			destWidth: Number,
			destHeight: Number,
			minHeight: {
				type: Number,
				default: 200
			},
			maxHeight: {
				type: Number,
				default: 600
			},
			isLockWidth: {
				type: Boolean,
				default: false
			},
			isLockHeight: {
				type: Boolean,
				default: false
			},
			isLockRatio: {
				type: Boolean,
				default: true
			},
			scaleRatio: {
				type: Number,
				default: 1
			},
			minRatio: {
				type: Number,
				default: 0.5
			},
			maxRatio: {
				type: Number,
				default: 2
			},
			isDisableScale: {
				type: Boolean,
				default: false
			},
			isDisableRotate: {
				type: Boolean,
				default: false
			},
			isLimitMove: {
				type: Boolean,
				default: false
			},
			isShowPhotoBtn: {
				type: Boolean,
				default: true
			},
			isShowRotateBtn: {
				type: Boolean,
				default: true
			},
			isShowConfirmBtn: {
				type: Boolean,
				default: true
			},
			isShowCancelBtn: {
				type: Boolean,
				default: true
			},
			rotateAngle: {
				type: Number,
				default: 90
			},
			source: {
				type: Object,
				default: () => ({
					album: '从相册中选择',
					camera: '拍照',
					// #ifdef MP-WEIXIN
					message: '从微信中选择'
					// #endif
				})
			}
		},
		data() {
			return {
				rotateImg,
				photoImg,
				canvasWidth: 0,
				canvasHeight: 0,
				clipX: 0,
				clipY: 0,
				clipWidth: 0,
				clipHeight: 0,
				animation: false,
				imageWidth: 0,
				imageHeight: 0,
				imageTop: 0,
				imageLeft: 0,
				scale: 1,
				angle: 0,
				image: '',
				sysinfo: {},
				throttleTimer: null,
				throttleFlag: true,
				timeClipCenter: null,
				flagClipTouch: false,
				flagEndTouch: false,
				clipStart: {},
				animationTimer: null,
				touchRelative: [{ x: 0, y: 0 }],
				hypotenuseLength: 0,
				ctx: null
			};
		},
		computed: {
			clipStyle() {
				const { clipWidth, clipHeight, clipY, clipX, animation } = this
				return `
			width: ${clipWidth}px;
			height:${clipHeight}px;
			transition-property: ${animation ? '' : 'background'};
			left: ${clipX}px;
			top: ${clipY}px
			`
			},
			imageStyle() {
				const { imageWidth, imageHeight, imageLeft, imageTop, animation, scale, angle } = this
				return `
				width: ${imageWidth ? imageWidth + 'px' : 'auto'};
				height: ${imageHeight ? imageHeight + 'px' : 'auto'};
				transform: translate3d(${imageLeft - imageWidth / 2}px, ${imageTop - imageHeight / 2}px, 0) scale(${scale}) rotate(${angle}deg);
				transition-duration: ${animation ? 0.35 : 0}s
			`
			},
			clipSize() {
				const { clipWidth, clipHeight } = this;
				return { clipWidth, clipHeight };
			},
			clipPoint() {
				const { clipY, clipX } = this;
				return { clipY, clipX };
			}
		},
		watch: {
			value(val) {
				if (!val) {
					this.animation = 0
					this.angle = 0
				} else {
					if (this.imageUrl) {
						const { imageWidth, imageHeight, imageLeft, imageTop, scale, clipX, clipY, clipWidth, clipHeight, path } =
						cache?.[this.imageUrl] || {}
						if (path != this.image) {
							this.image = this.imageUrl;
						} else {
							this.setDiffData({ imageWidth, imageHeight, imageLeft, imageTop, scale, clipX, clipY, clipWidth,
									clipHeight })
						}

					}

				}
			},
			imageUrl(url) {
				this.image = url
			},
			image: {
				handler: async function(url) {
					this.getImageInfo(url)
				},
				// immediate: true,
			},
			clipSize({ widthVal, heightVal }) {
				let { minWidth, minHeight } = this;
				minWidth = minWidth / 2;
				minHeight = minHeight / 2;
				if (widthVal < minWidth) {
					this.setDiffData({ clipWidth: minWidth })
				}
				if (heightVal < minHeight) {
					this.setDiffData({ clipHeight: minHeight })
				}
				this.calcClipSize();
			},
			angle(val) {
				this.animation = true;
				this.moveStop();
				const { isLimitMove } = this;
				if (isLimitMove && val % 90) {
					this.setDiffData({
						angle: Math.round(val / 90) * 90
					})
				}
				this.imgMarginDetectionScale();
			},
			animation(val) {
				clearTimeout(this.animationTimer);
				if (val) {
					let animationTimer = setTimeout(() => {
						this.setDiffData({
							animation: false
						})
					}, 260);
					this.setDiffData({ animationTimer })
					this.animationTimer = animationTimer;
				}
			},
			isLimitMove(val) {
				if (val) {
					if (this.angle % 90) {
						this.setDiffData({
							angle: Math.round(this.angle / 90) * 90
						})
					}
					this.imgMarginDetectionScale();
				}
			},
			clipPoint() {
				this.cutDetectionPosition();
			},
			width(width, oWidth) {
				if (width !== oWidth) {
					this.setDiffData({
						clipWidth: width / 2
					})
				}
			},
			height(height, oHeight) {
				if (height !== oHeight) {
					this.setDiffData({
						clipHeight: height / 2
					})
				}
			}
		},
		mounted() {
			const sysinfo = uni.getSystemInfoSync();
			this.sysinfo = sysinfo;
			this.setClipInfo();
			this.image = this.imageUrl || this.image
			this.setClipCenter();
			this.calcClipSize();
			this.cutDetectionPosition();
		},
		methods: {
			setDiffData(data) {
				Object.keys(data).forEach(key => {
					if (this[key] !== data[key]) {
						this[key] = data[key];
					}
				});
			},
			getImageInfo(url) {
				if (!url) return;
				if (this.value) {
					uni.showLoading({
						title: '请稍候...',
						mask: true
					});
				}
				uni.getImageInfo({
					src: url,
					success: res => {
						if (['right', 'left'].includes(res.orientation)) {
							this.imgComputeSize(res.height, res.width);
						} else {
							this.imgComputeSize(res.width, res.height);
						}
						this.image = res.path;
						if (this.isLimitMove) {
							this.imgMarginDetectionScale();
							this.$emit('ready', res);
						}
						const { imageWidth, imageHeight, imageLeft, imageTop, scale, clipX, clipY, clipWidth, clipHeight } =
						this
						cache[url] = Object.assign(res, { imageWidth, imageHeight, imageLeft, imageTop, scale, clipX, clipY,
							clipWidth, clipHeight });
					},
					fail: (err) => {
						this.imgComputeSize();
						if (this.isLimitMove) {
							this.imgMarginDetectionScale();
						}
					}
				});

			},
			setClipInfo() {
				const { width, height, sysinfo, canvasId } = this;
				const clipWidth = width / 2;
				const clipHeight = height / 2;
				const clipY = (sysinfo.windowHeight - clipHeight) / 2;
				const clipX = (sysinfo.windowWidth - clipWidth) / 2;
				const imageLeft = sysinfo.windowWidth / 2;
				const imageTop = sysinfo.windowHeight / 2;
				this.ctx = uni.createCanvasContext(canvasId, this);
				this.clipWidth = clipWidth;
				this.clipHeight = clipHeight;
				this.clipX = clipX;
				this.clipY = clipY;
				this.canvasHeight = clipHeight;
				this.canvasWidth = clipWidth;
				this.imageLeft = imageLeft;
				this.imageTop = imageTop;
			},
			setClipCenter() {
				const { sysInfo, clipHeight, clipWidth, imageTop, imageLeft } = this;
				let sys = sysInfo || uni.getSystemInfoSync();
				let clipY = (sys.windowHeight - clipHeight) * 0.5;
				let clipX = (sys.windowWidth - clipWidth) * 0.5;
				this.imageTop = imageTop - this.clipY + clipY;
				this.imageLeft = imageLeft - this.clipX + clipX;
				this.clipY = clipY;
				this.clipX = clipX;
			},
			calcClipSize() {
				const { clipHeight, clipWidth, sysinfo, clipX, clipY } = this;
				if (clipWidth > sysinfo.windowWidth) {
					this.setDiffData({
						clipWidth: sysinfo.windowWidth
					})
				} else if (clipWidth + clipX > sysinfo.windowWidth) {
					this.setDiffData({
						clipX: sysinfo.windowWidth - clipX
					})
				}
				if (clipHeight > sysinfo.windowHeight) {
					this.setDiffData({
						clipHeight: sysinfo.windowHeight
					})
				} else if (clipHeight + clipY > sysinfo.windowHeight) {
					this.clipY = sysinfo.windowHeight - clipY;
					this.setDiffData({
						clipY: sysinfo.windowHeight - clipY
					})
				}
			},
			cutDetectionPosition() {
				const { clipX, clipY, sysinfo, clipHeight, clipWidth } = this;
				let cutDetectionPositionTop = () => {
						if (clipY < 0) {
							this.setDiffData({ clipY: 0 })
						}
						if (clipY > sysinfo.windowHeight - clipHeight) {
							this.setDiffData({ clipY: sysinfo.windowHeight - clipHeight })
						}
					},
					cutDetectionPositionLeft = () => {
						if (clipX < 0) {
							this.setDiffData({ clipX: 0 })
						}
						if (clipX > sysinfo.windowWidth - clipWidth) {
							this.setDiffData({ clipX: sysinfo.windowWidth - clipWidth })
						}
					};
				if (clipY === null && clipX === null) {
					let newClipY = (sysinfo.windowHeight - clipHeight) * 0.5;
					let newClipX = (sysinfo.windowWidth - clipWidth) * 0.5;
					this.setDiffData({
						clipX: newClipX,
						clipY: newClipY
					})
				} else if (clipY !== null && clipX !== null) {
					cutDetectionPositionTop();
					cutDetectionPositionLeft();
				} else if (clipY !== null && clipX === null) {
					cutDetectionPositionTop();
					this.setDiffData({
						clipX: (sysinfo.windowWidth - clipWidth) / 2
					})
				} else if (clipY === null && clipX !== null) {
					cutDetectionPositionLeft();
					this.setDiffData({
						clipY: (sysinfo.windowHeight - clipHeight) / 2
					})
				}
			},
			imgComputeSize(width, height) {
				const { imageWidth, imageHeight } = calcImageSize(width, height, this);
				this.imageWidth = imageWidth;
				this.imageHeight = imageHeight;
			},
			imgMarginDetectionScale(scale) {
				if (!this.isLimitMove) return;
				const currentScale = calcImageScale(this, scale);
				this.imgMarginDetectionPosition(currentScale);
			},
			imgMarginDetectionPosition(scale) {
				if (!this.isLimitMove) return;
				const { scale: currentScale, left, top } = calcImageOffset(this, scale);
				this.setDiffData({
					imageLeft: left,
					imageTop: top,
					scale: currentScale
				})
			},
			throttle() {
				this.setDiffData({
					throttleFlag: true
				})
			},
			moveDuring() {
				clearTimeout(this.timeClipCenter);
			},
			moveStop() {
				clearTimeout(this.timeClipCenter);
				const timeClipCenter = setTimeout(() => {
					if (!this.animation) {
						this.setDiffData({ animation: true })
					}
					this.setClipCenter();
				}, 800);
				this.setDiffData({ timeClipCenter })
			},
			clipTouchStart(event) {
				// #ifdef H5
				event.preventDefault()
				// #endif
				if (!this.image) {
					uni.showToast({
						title: '请选择图片',
						icon: 'none'
					});
					return;
				}
				const currentX = event.touches[0].clientX;
				const currentY = event.touches[0].clientY;
				const { clipX, clipY, clipWidth, clipHeight } = this;
				const corner = determineDirection(clipX, clipY, clipWidth, clipHeight, currentX, currentY);
				this.moveDuring();
				if (!corner) { return }
				this.clipStart = {
					width: clipWidth,
					height: clipHeight,
					x: currentX,
					y: currentY,
					clipY,
					clipX,
					corner
				};
				this.flagClipTouch = true;
				this.flagEndTouch = true;
			},
			clipTouchMove(event) {
				// #ifdef H5
				event.stopPropagation()
				event.preventDefault()
				// #endif
				if (!this.image) {
					uni.showToast({
						title: '请选择图片',
						icon: 'none'
					});
					return;
				}
				// 只针对单指点击做处理
				if (event.touches.length !== 1) {
					return;

				}
				const { flagClipTouch, throttleFlag } = this;
				if (flagClipTouch && throttleFlag) {
					const { isLockRatio, isLockHeight, isLockWidth } = this;
					if (isLockRatio && (isLockWidth || isLockHeight)) return;
					this.setDiffData({
						throttleFlag: false
					})
					this.throttle();
					const clipData = clipTouchMoveOfCalculate(this, event);
					if (clipData) {
						const { width, height, clipX, clipY } = clipData;
						if (!isLockWidth && !isLockHeight) {
							this.setDiffData({
								clipWidth: width,
								clipHeight: height,
								clipX,
								clipY
							})
						} else if (!isLockWidth) {
							this.setDiffData({
								clipWidth: width,
								clipX
							})
						} else if (!isLockHeight) {
							this.setDiffData({
								clipHeight: height,
								clipY
							})
						}
						this.imgMarginDetectionScale();
					}

				}
			},
			clipTouchEnd() {
				this.moveStop();
				this.flagClipTouch = false;
			},
			imageTouchStart(e) {
				// #ifdef H5
				event.preventDefault()
				// #endif
				this.flagEndTouch = false;
				const { imageLeft, imageTop } = this;
				const clientXForLeft = e.touches[0].clientX;
				const clientYForLeft = e.touches[0].clientY;

				let touchRelative = [];
				if (e.touches.length === 1) {
					touchRelative[0] = {
						x: clientXForLeft - imageLeft,
						y: clientYForLeft - imageTop
					};
					this.touchRelative = touchRelative;
				} else {
					const clientXForRight = e.touches[1].clientX;
					const clientYForRight = e.touches[1].clientY;
					let width = Math.abs(clientXForLeft - clientXForRight);
					let height = Math.abs(clientYForLeft - clientYForRight);
					const hypotenuseLength = calcPythagoreanTheorem(width, height);

					touchRelative = [{
							x: clientXForLeft - imageLeft,
							y: clientYForLeft - imageTop
						},
						{
							x: clientXForRight - imageLeft,
							y: clientYForRight - imageTop
						}
					];
					this.touchRelative = touchRelative;
					this.hypotenuseLength = hypotenuseLength;
				}
			},
			imageTouchMove(e) {
				// #ifdef H5
				event.preventDefault()
				// #endif
				const { flagEndTouch, throttleFlag } = this;
				if (flagEndTouch || !throttleFlag) return;
				const clientXForLeft = e.touches[0].clientX;
				const clientYForLeft = e.touches[0].clientY;
				this.setDiffData({ throttleFlag: false })
				this.throttle();
				this.moveDuring();
				if (e.touches.length === 1) {
					const { left: imageLeft, top: imageTop } = imageTouchMoveOfCalcOffset(this, clientXForLeft, clientYForLeft);
					this.setDiffData({
						imageLeft,
						imageTop
					})
					this.imgMarginDetectionPosition();
				} else {
					const clientXForRight = e.touches[1].clientX;
					const clientYForRight = e.touches[1].clientY;
					let width = Math.abs(clientXForLeft - clientXForRight),
						height = Math.abs(clientYForLeft - clientYForRight),
						hypotenuse = calcPythagoreanTheorem(width, height),
						scale = this.scale * (hypotenuse / this.hypotenuseLength);
					if (this.isDisableScale) {

						scale = 1;
					} else {
						scale = scale <= this.minRatio ? this.minRatio : scale;
						scale = scale >= this.maxRatio ? this.maxRatio : scale;
						this.$emit('change', {
							width: this.imageWidth * scale,
							height: this.imageHeight * scale
						});
					}

					this.imgMarginDetectionScale(scale);
					this.hypotenuseLength = Math.sqrt(Math.pow(width, 2) + Math.pow(height, 2));
					this.scale = scale;
				}
			},
			imageTouchEnd() {
				this.setDiffData({
					flagEndTouch: true
				})
				this.moveStop();
			},
			uploadImage() {
				const itemList = Object.entries(this.source)
				const sizeType = ['original', 'compressed']
				const success = ({ tempFilePaths: a, tempFiles: b }) => {
					this.image = a ? a[0] : b[0].path
				};
				const _uploadImage = (type) => {
					if (type !== 'message') {
						uni.chooseImage({
							count: 1,
							sizeType,
							sourceType: [type],
							success
						});
					}
					// #ifdef MP-WEIXIN
					if (type == 'message') {
						wx.chooseMessageFile({
							count: 1,
							type: 'image',
							success
						})
					}
					// #endif
				}
				if (itemList.length > 1) {
					uni.showActionSheet({
						itemList: itemList.map(v => v[1]),
						success: ({ tapIndex: i }) => {
							_uploadImage(itemList[i][0])
						}
					})
				} else {
					_uploadImage(itemList[0][0])
				}
			},
			imageReset() {
				const sys = this.sysinfo || uni.getSystemInfoSync();
				this.scale = 1;
				this.angle = 0;
				this.imageTop = sys.windowHeight / 2;
				this.imageLeft = sys.windowWidth / 2;
			},
			imageLoad(e) {
				this.imageReset();
				uni.hideLoading();
				this.$emit('ready', e.detail);
			},
			rotate(event) {
				if (this.isDisableRotate) return;
				if (!this.image) {
					uni.showToast({
						title: '请选择图片',
						icon: 'none'
					});
					return;
				}
				const { rotateAngle } = this;
				const originAngle = this.angle
				const type = event.currentTarget.dataset.type;
				if (type === 'along') {
					this.angle = originAngle + rotateAngle
				} else {
					this.angle = originAngle - rotateAngle
				}
				this.$emit('rotate', this.angle);
			},
			confirm() {
				if (!this.image) {
					uni.showToast({
						title: '请选择图片',
						icon: 'none'
					});
					return;
				}
				uni.showLoading({
					title: '加载中'
				});
				const { canvasHeight, canvasWidth, clipHeight, clipWidth, ctx, scale, imageLeft, imageTop, clipX, clipY, angle,
					scaleRatio: dpr, image, quality, fileType, type: imageType, canvasId } = this;
				const draw = () => {
					const imageWidth = this.imageWidth * scale * dpr;
					const imageHeight = this.imageHeight * scale * dpr;
					const xpos = imageLeft - clipX;
					const ypos = imageTop - clipY;
					ctx.translate(xpos * dpr, ypos * dpr);
					ctx.rotate((angle * Math.PI) / 180);
					ctx.drawImage(image, -imageWidth / 2, -imageHeight / 2, imageWidth, imageHeight);
					ctx.draw(false, () => {
						const width = clipWidth * dpr
						const height = clipHeight * dpr
						let params = {
							x: 0,
							y: 0,
							width,
							height,
							destWidth: this.destWidth || width,
							destHeight: this.destHeight || height,
							canvasId: canvasId,
							fileType,
							quality,
							success: (res) => {
								// 钉钉小程序
								data.url = res.tempFilePath || res.filePath;
								data.source = this.image;
								uni.hideLoading();
								this.$emit('success', data);
								this.$emit('input', false)
							},
							fail: (error) => {
								console.error('error', error)
								this.$emit('fail', error);
								this.$emit('input', false)
							}
						};

						let data = {
							url: '',
							width,
							height
						};
						uni.canvasToTempFilePath(params, this)
					});
				};

				if (canvasWidth !== clipWidth || canvasHeight !== clipHeight) {
					this.canvasWidth = clipWidth;
					this.canvasHeight = clipHeight;
					ctx.draw();
					this.$nextTick(() => {
						setTimeout(() => {
							draw();
						}, 100);
					})
				} else {
					draw();
				}
			},
			cancel() {
				this.$emit('cancel', false)
				this.$emit('input', false)
			},
		}
	};
</script>

<style lang="stylus" scoped>
	@import './index'
</style>